Update httpmock requirement from 0.5 to 0.6

[dependabot]

Updates the requirements on httpmock to permit the latest version.

Release notes

Sourced from httpmock's releases.

v0.6.7

Version 0.6.7

• This is a maintenance release that updates all dependencies to the most recent version.

Changelog

Sourced from httpmock's changelog.

Version 0.6.7

• This is a maintenance release that updates all dependencies to the most recent version.

Version 0.6.6

• Extended some API methods to allow for more type flexibility (see alexliesenfeld/httpmock#58). Thanks to @​95th for providing the PR!
• Fixed parsing query parameter values that contain + to represent space (see alexliesenfeld/httpmock#56). Thanks to @​95th for providing the PR!
• Added a new Cargo feature cookie to shorten compile time (see alexliesenfeld/httpmock#63). Thanks to mythmon for providing this PR!

Version 0.6.5

• Fixes a race condition that could occur when deleting mocks from the mock server (see alexliesenfeld/httpmock#53).
• Replaced internal diff library (switched from difference to similar, see alexliesenfeld/httpmock#55).

Version 0.6.4

• Fixed minimum Rust version in README (raised from 1.47 to 1.54, see release 0.6.3 for more information).

Version 0.6.3

• This is a maintenance release that updates all dependencies to the most recent version.
• Bumped minimum Rust version to 1.54 due to transitive dependency.

Version 0.6.2

• A bug was fixed that has unexported the When and Then structures. Both types are now exported again. Please refer to alexliesenfeld/httpmock#47 for more info.

Version 0.6.1

• This is a maintenance release that updates all dependencies to the most recent version.

Version 0.6.0

General

• Old Mock structure based API was deprecated starting from version 0.5.0 and was removed with this version. Please switch to the new API based on the When / Then structures.
• The two methods MockRef::times_called and MockRef::times_called_async were deprecated since version 0.5.0 and have now been removed.
• A prelude module was added to shorten imports that are usually required when using httpmock in tests.
• The struct MockRef has been renamed to Mock.
• Trait MockRefExt has been renamed to MockExt.
• Added support for x-www-form-urlencoded request bodies.

... (truncated)

Commits

• a87b301 Raise version to 0.6.7
• 8fe3765 Update dependencies
• 1aea10b Merge pull request #68 from kianmeng/fix-typos-and-markdowns
• 7509e09 Fix typos and markdowns
• ec0a3b8 Fix example typos
• 120d181 Fix example typos
• 339945c Update README.md
• 027b334 (cargo-release) start next development iteration 0.6.7-alpha.0
• 2efdb51 Update CHANGELOG.md
• 2d780c4 Formatting
• Additional commits viewable in compare view

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